Precursor-Led Grain Boundary Engineering for Superior Thermoelectric Performance in Niobium Strontium Titanate.

ABSTRACT: We present a novel method to significantly enhance the thermoelectric performance of ceramics in the model system SrTi_0.85Nb_0.15O₃ through the use of the precursor ammonium tetrathiomolybdate (0.5-2% w/w additions). After sintering the precursor-infused green body at 1700 K for 24 h in 5% H₂/Ar, single-crystal-like electron transport behavior developed with electrical conductivity reaching ∼3000 S/cm at ∼300 K, almost a magnitude higher than that in the control sample. During processing, the precursor transformed into MoS₂, then into MoO_x, and finally into Mo particles. This limited grain growth promoted secondary phase generation but importantly helped to reduce the grain boundary barriers. Samples prepared with addi

SUBMITTER: Zhu Y 

PROVIDER: S-EPMC10020962 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature